grade_query.aspx.cs

一个学生管理系统的C++源程序

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Configuration;

namespace sms
{
	/// <summary>
	/// grade_query 的摘要说明。
	/// </summary>
	public class grade_query : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.Button Btn_ok;
		protected System.Web.UI.WebControls.DataGrid Dgd_grade;
		protected System.Web.UI.WebControls.TextBox Tbx_course;
		protected System.Web.UI.WebControls.Button Btn_information;
		protected System.Web.UI.WebControls.Label Lbl_note;
		protected System.Web.UI.WebControls.Button Btn_exit;
		protected System.Web.UI.WebControls.Label Lbl_must;
		protected System.Web.UI.WebControls.Label Lbl_sort;
	    string strsql;
		protected System.Web.UI.WebControls.TextBox Tbx_term;
		protected System.Web.UI.WebControls.Button Btn_look;
		protected System.Web.UI.WebControls.Button Btn_see;
		protected System.Web.UI.WebControls.Button Btn_personnel;
		protected System.Web.UI.WebControls.Button Btn_course;
		protected System.Web.UI.WebControls.Button Btn_grade;SqlConnection cn;
		private void Page_Load(object sender, System.EventArgs e)
		{
			// 在此处放置用户代码以初始化页面
		string strconn= ConfigurationSettings.AppSettings["dsn"];
			cn=new SqlConnection(strconn);	
		}

		#region Web Form Designer generated code
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN：该调用是 ASP.NET Web 窗体设计器所必需的。
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{    
			this.Btn_information.Click += new System.EventHandler(this.Btn_information_Click);
			this.Btn_see.Click += new System.EventHandler(this.Btn_see_Click);
			this.Btn_personnel.Click += new System.EventHandler(this.Btn_personnel_Click);
			this.Btn_course.Click += new System.EventHandler(this.Btn_course_Click);
			this.Btn_grade.Click += new System.EventHandler(this.Btn_grade_Click);
			this.Btn_ok.Click += new System.EventHandler(this.Btn_ok_Click);
			this.Btn_exit.Click += new System.EventHandler(this.Btn_exit_Click);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private void Btn_information_Click(object sender, System.EventArgs e)
		{
			Response.Redirect("query.aspx");
		}

		private void Btn_ok_Click(object sender, System.EventArgs e)
		{
			
			if(Tbx_course.Text=="")
			{
				strsql="select course.Course_name,student_course.Course_id,Course_year,Student_grade,Course_credit,Course_kind from student_course,course where Course_year='"+Tbx_term.Text+"' and student_course.Course_id=course.Course_id and Student_id='"+Session["User_id"].ToString()+"'";
				
			}
			else
			{
				strsql="select course.Course_name,student_course.Course_id,Course_year,Student_grade,Course_credit,Course_kind from student_course,course where Course_year='"+Tbx_term.Text+"'and course.Course_id=student_course.Course_id and course.Course_name='"+Tbx_course.Text+"'and Student_id='"+Session["User_id"].ToString()+"'";
			}
			cn.Open();
			SqlDataAdapter da=new SqlDataAdapter(strsql,cn);
			DataSet ds=new DataSet();
			da.Fill(ds);
			Dgd_grade.DataSource=ds;
			Dgd_grade.DataBind();
			cn.Close();
			Lbl_note.Visible=true;
			display();
		}
		public void display()
		{strsql="select SUM(Course_credit) from course,student_course where Course_year='"+Tbx_term.Text+"' and Student_id=@Student_id and student_course.Course_id=course.Course_id and Course_kind=2 and Student_grade>=60";
			SqlCommand cm=new SqlCommand(strsql,cn);
			cm.Parameters.Add(new SqlParameter("@Student_id",SqlDbType.VarChar,50));
			cm.Parameters["@Student_id"].Value=Session["User_id"].ToString();
			cn.Open();
			SqlDataReader dr=cm.ExecuteReader();
			if(dr.Read())
			{
				Lbl_sort.Text="本学期选修课的总学分为："+dr[0].ToString();
			}
			else
			{
				Lbl_sort.Text="本学期选修课的总学分为：0";
			}
			cn.Close();
			strsql="select SUM(Course_credit) from course,student_course where Course_year='"+Tbx_term.Text+"' and Student_id=@Student_id and student_course.Course_id=course.Course_id and Course_kind<2 and Student_grade>=60";
			cm=new SqlCommand(strsql,cn);
			cm.Parameters.Add(new SqlParameter("@Student_id",SqlDbType.VarChar,50));
			cm.Parameters["@Student_id"].Value=Session["User_id"].ToString();
			cn.Open();
			dr=cm.ExecuteReader();
			if(dr.Read())
			{
				Lbl_must.Text="本学期必修课的总学分为："+dr[0].ToString();
			}
			else
			{
				Lbl_must.Text="本学期必修课的总学分为：0";
			}
			cn.Close();		
		}

		private void Btn_exit_Click(object sender, System.EventArgs e)
		{
			Response.Redirect("query.aspx");
		}

		
		private void Btn_see_Click(object sender, System.EventArgs e)
		{
		  Response.Redirect("sortcourse.aspx");
		}

		private void Btn_personnel_Click(object sender, System.EventArgs e)
		{
		Response.Redirect("updatepwd.aspx");
		}

		private void Btn_course_Click(object sender, System.EventArgs e)
		{
			Response.Redirect("course_student.aspx");
		}

		private void Btn_grade_Click(object sender, System.EventArgs e)
		{
			Response.Redirect("grade_query.aspx");
		}
	}
}